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    1. Azelaic Acid Acid used in acne and rosacea creams
    2. Biotin B vitamin, often sold as a hair supplement
    3. Vitamin D Vitamin made in the skin from sunlight, also taken as a supplement
    4. KY19382 Experimental compound that activates hair-growth signals, tested only in animals
    5. Osteopontin Signalling protein studied in hair-growth research